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* In Generation II and {{game|HeartGold and SoulSilver|s}}, a fan of Bill's named Brent will reveal trivia about Bill via the [[Pokégear]]. The information shared include the fact that Bill's younger sister can't wink, Bill's first Pokémon caught was {{p|Abra}}, his mother used to be a [[Kimono Girl]], Bill is lactose intolerant (also claimed by Celio in {{game|FireRed and LeafGreen|s}}), he isn't very good at Pokémon battles, and that Bill is attracted to the Goldenrod Flower Shop owner's daughter.

* In the English dub of the anime, his {{wp|Kansai dialect}} is portrayed as a {{wp|Regional accents of English|British English accent}}, while in the Pokémon Adventures manga, this becomes a southern American accent.

* In the anime, He looks [[Anime character recycling|nearly identical]] to a character of the day named [[Dominick]] from the [[Hoenn|Hoenn region]], even though the two have no apparent connections whatsoever.

* The Pokémon Bill is mixed with is different in each canon: in Generation I he is mixed with an unknown Pokémon, in Generation III he is mixed with a {{p|Clefairy}}, in the Pokémon Adventures manga he is mixed with a {{p|Rattata}}, in the Pokémon Zensho manga he is mixed with a {{p|Nidoran♂}}, and in the anime he is trapped in a {{p|Kabuto}} costume.

* According to a [[Pokémon Daisuki Club]] site describing the [[Pokémon world]], Bill studied at [[Celadon University]].